Andropogon bicornis
Andropogon tracyi
Barbas de indio
Tracy's bluestem
60-250 cm;
internodes not glaucous.
50-120 cm;
internodes not glaucous;
branches mostly erect, straight.
smooth;
ligules 0.6-1 mm;
blades 20-70 cm long, 2-7 mm wide, usually glabrous or scabrous on the margins.
smooth;
ligules 0.2-0.5 mm, ciliate, cilia 0.2-0.8 mm;
blades 10-22 cm long, 1.2-2.6 mm wide, glabrous or sparsely pubescent, with spreading hairs.
50-500; subtending sheaths 2.5-4.5 cm long, 2-3 mm wide;
peduncles 20-70 mm, with 2(3) rames;
rames 2-4 cm, exerted at maturity;
internodes filiform, densely and evenly pubescent, hairs 3-9 mm.
3-11 per culm; subtending sheaths (2.8)4.1-5.8(7.2) cm long, (3)4-4.7(5.8) mm wide;
peduncles (9)14-31(65) mm, with 2 rames;
rames (1.5)2.4-3.6(4.2) cm, usually exserted at maturity, pubescence increasing in density distally within each internode.
spikelets 3-4 mm; unawned;
callus hairs 0.5-1 mm;
keels of lower glumes scabrous above the midpoint;
anthers 3, 1-1.4 mm.
spikelets (4)4.8-5(5.5) mm;
callus hairs 1.5-3.5 mm;
keels of lower glumes scabrous only above the midpoint;
awns 11-23 mm;
anthers 1, 1.2-2 mm, yellow.
spikelets mostly vestigial or absent, 1-2 of those in the terminal units on each rame 3-5 mm and staminate.
spikelets vestigial or absent.
= 60, 120.
= 20.
Andropogon bicornis
Andropogon tracyi
Andropogon bicornis is a widespread species of the Western Hemisphere tropics. It was collected in the early 1960s in Dade County, Florida, near the track of a major hurricane, but may not be established in the Flora region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Andropogon tracyi grows on sandhills, sandy pinelands, and scrublands of the southeastern United States. It resembles A. longiberbis, but usually differs in having sparsely pubescent blades and a more slender appearance.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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